If fixed costs are $333,000, the unit selling price is $73, and the unit variable costs are $48, what are the old and new break-even sales in units (rounded to a whole number) if the unit selling price increases by $5?

a.13,320 units and 4,562 units

b.4,562 units and 13,320 units

c.6,938 units and 10,600 units

d.13,320 units and 11,100 units